crackly / clicking noise on start up???!

had the glow plug light flashing for a few days then it went off and couldn't get to a garage due to work

then the light went off and was fine, light came back on cars booked into garage tomorrow morning to have them see what the fault code is

now tonight it is rather chilly, went to go out and the light had gone but then i hear this really odd crackly/ clicking noise? open the bonnet and it sounds like its coming frm right underneath the engine cover, not sure what this is or if i should drive the car

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